Positive Displacement Pump Buyers Guide

A positive displacement pump makes a fluid move by trapping a fixed amount and forcing (displacing) that trapped volume into the discharge pipe. Some positive displacement pumps use an expanding cavity on the suction side and a decreasing cavity on the discharge side. Liquid flows into the pump as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. The volume is constant through each cycle of operation.

Positive displacement pumps, unlike centrifugal or roto-dynamic pumps, theoretically can produce the same flow at a given speed (RPM) no matter what the discharge pressure. Thus, positive displacement pumps are constant flow machines. However, a slight increase in internal leakage as the pressure increases prevents a truly constant flow rate.

A positive displacement pump must not operate against a closed valve on the discharge side of the pump, because it has no shutoff head like centrifugal pumps. A positive displacement pump operating against a closed discharge valve continues to produce flow and the pressure in the discharge line increases until the line bursts, the pump is severely damaged, or both.

Below you will find manufacturers representatives who handle a wide array of Positive Displacement Pumps.

For specific manufacturer please use the Pumps By Manufacturer section on the top navigation bar.

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Our Publisher and Owner has been involved in the Canadian Process Control Market for over 35 years. As a former publisher and founder of one of our competitor's print publications in 1992 he left and began his own print magazine known as The Complete Process Products Book which evolved into Process Controls and Instrumentation News. In 1999 we created www.process-controls.com which contained an online Buyers Guide. We further evolved to the web site you see today and began to develop and maintain web sites for our clients. We introduced The Process News in February 2004 with a worldwide circulation of 43,000 readers providing up-to-date information on the latest products.

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Process News bi-weekly newsletter is sent out every second Tuesday to over 45,000 readers worldwide. Process News was designed to make it easy to obtain product information, get quotes, contact manufacturers or their representatives. The pages that follow contain the latest information supplied to us from manufacturers and their representatives on new products or services offered to the process controls and instrumentation market. Twice per month the Process News newsletter will be sent to you from Process Controls and Instrumentation. Each newsletter will contain the latest up-to-date product information available. Click Here to see the latest newsletter.